PH Swings and Crushed coral in filter QA

Discussion in 'Planted Tank Equipment' started by Asterix, May 28, 2012.

  1. Asterix
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    Asterix Algae harvester

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    Hi All

    need some advice. I'm getting hectic pH swings, when CO2 is being injected during lighting period pH sits at 6.9 once lights go off it rises to pH 8.

    No i have read some people put Crushed coral in there filters to limit the swing. My plans are to keep discus and i'm worried about these pH swings. Ideally i would like to maintain at 6.9 to 7 or lower but nothing higher.

    I have tried using Seachem regulator pH 7 but this has done nothing.

    any advice.

    thanks
     
  2. Andre
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    Andre Green fingers

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    Hi Asterix

    What is the KH and general hardness of your water? This is a more important factor in keeping discus that the pH alone. From what you are telling us it seems that your water is quite hard and you might have to look at using RO water and a solenoid valve and pH controller on your CO2 system.
     
  3. Asterix
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    Asterix Algae harvester

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    not sure on KH will have to measure tonight.

    I see peet moss in filter can help...anybody recomend?
     
  4. Andre
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    Andre Green fingers

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    Peat moss will help and is a better option than coral. The crushed coral will push your KH and pH upwards and while the the peat moss will lower the KH somewhat. If your water is very hard it will quickly get saturated though and you will have to replace it quite often. It will also stain your water yellow.
     
  5. Asterix
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    Asterix Algae harvester

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    hi all

    what are your thoughts on Activated carbon and pH increases. I read that "Cheap" activated carbon could cause a rise in pH values...

    any views?
     
  6. Andre
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    Andre Green fingers

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    Activated Carbon on its own won't increase your pH, but if it becomes saturated (this can happen quite quickly) it can start leeching absorbed chemicals back into the water. Activated carbon should be replace quite often or used to absorb excess medication etc after treatment and not as a permanent filter component.
     
  7. Asterix
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    Asterix Algae harvester

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    So in otherwords, it better to run with out Activated carbon?

    and only use it in the event of Emergency?

    I just wondering if thats maybe my problem, i currently run that (activated carbon no name brand) with Purigen and Efi substrate for biological filtration.
     
  8. Andre
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    Andre Green fingers

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    Yes

    The source of your problem is most probably your tap water. Joburg's water supply normally has quite a high KH which will push up your pH. The CO2 will help to lower the pH but it will not be able to lower the KH of your water. I know quite a few people (WBS included) that have succesfully kept discus in Joburg water, but these fish are from soft water ecosystems and to give yourself the biggest chance of success with them you might want to go with an RO system to lower your KH as this will be more of a problem for discus than the pH swings.
     
  9. Trev Pleco
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    Trev Pleco Algae destroyer

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    Does one have to place the crushed corral in the filter, I have pouches of it in my bigger tanks in the canisters, but there's not much space for it in the HOBs in the smaller tanks, can I perhaps hide a pouch of it behind a rock, where there is still good circulation ?
     
  10. Andre
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    Andre Green fingers

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    That should be fine, seeing as it will disolve over time
     
  11. Trev Pleco
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    Trev Pleco Algae destroyer

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    cool, thanks
     

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